Perspective Question

[angryswine]

Alright, this may seem obvious and I think I know the answer, but am afraid to assume that and practice this the wrong way. This refering to the question of whether or not multiple objects facing different angles would have multiple vanishing points on a horizon or eye level line in two or three point perspective. The question has kept my mind busy for awhile now, I read through most of an advanced perspective website, though couldnt find a place that specifically addressed the question, maybe because its obvious despite how oblivious I feel. Does anyone have an idea of what I mean? An answer to this would definately be very much appreciated. Thanks all!

[angryswine]

Oh, btw I started including circular horizon lines in my perspective drawings, in order to accurately predict angles of rotated objects, which I later found (with much reading) is actually the cone of vision.. does this method seem impractical?

Thanks again :>

[DeadlyFreeze]

I don't think its carved in stone but generally speaking you can have multiple points in 2 point but not in 3. Since in a 3 point you use all 3 points you choose moving one or adding another would change the overall perspective.

In a 2 point you can choose another vanishing point as long as it shares an original vanishing point.

The left box breaks the perspective since it shares no points.
http://home.comcast.net/~dfart/perspective.jpg

...not that you cant do that or its wrong but it can mess things up.

[Elwell]

Alright, this may seem obvious and I think I know the answer, but am afraid to assume that and practice this the wrong way. This refering to the question of whether or not multiple objects facing different angles would have multiple vanishing points on a horizon or eye level line in two or three point perspective.
Objects will only share vanishing points if they are oriented in the same way relative to the viewer.

DeadlyFreeze, I don't think that picture is illustrating what you think it's illustrating.

[angryswine]

I see what you mean about 3 point.. i tried it and it does look off. Im noticing in 2 point perspective that you can have multiple vanishing points if they are evenly spaced, unless you go further out towards the edge of the picture plane, in which case it would begin to be distorted anyway. Also it seems like those evenly spaced vanishing points can be nearly anywhere on the picture plane and in any direction. This seems to be the right way to make, say a book tumbling down from the picture plane. Is this right or am I way off?

[Seedling]

http://conceptart.org/forums/showpost.php?p=1270798&postcount=185

[edit] To answer your question a little better, if you were to draw three cubes that had all been tossed into space, each of those cubes would have its own three vanishing points. And it would be pointless to bother putting a horizon into the image.

[mike yamada]

Multiple vanishing points in a single image are both plotable and extrapolated. If you assume that you can construct a perfect square, then you can divide it into known angles(in the example I used 45 degrees which was easily found by drawing lines connecting the diagonals of the original 1pt square). If you extend the lines dividing the square, you can extend them to find the new VPs on the horizon line.


http://img512.imageshack.us/img512/9706/perspko7.jpg

[angryswine]

Ohhh awesome responses guys, thanks a bunch. I thought about this all day and happened to be looking at a very curvilinear road today at work and noticed that not only do some sections of the road go off into a one point perspective vanishing point, they also go off into two point and even more astonishing... they sometimes have vanishing points above what I would think as my eye line/horizon line. A great day in my opinion. I like your explanations a lot Seedling and Mike Yamada :>

[FlipMcgee]

This refering to the question of whether or not multiple objects facing different angles would have multiple vanishing points on a horizon or eye level line in two or three point perspective.

Not only is it possible to have multiple vanishing points, it is also possible to have multiple or overlapping horizons.

I don't have time to explain this in a thousand words or less, so hopefully these photos will clue you in. (Another bonus tip, don't think of drawing horizon necessarily the same as the physical horizon. You'll get less confused understanding perspective this way.)


http://www.jetfighter.com.au/images/cockpit.jpg


http://img.photobucket.com/albums/v67/Flipmcgee/horizons.jpg


http://img.photobucket.com/albums/v67/Flipmcgee/angle02.jpg



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